Automotive screw jack

B - Operations – Transporting – 66 – F

Patent

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Details

B66F 3/10 (2006.01) B66F 3/16 (2006.01)

Patent

CA 2211823

A screw jack (20) includes a strand (21) which houses a side gear (58) which, when rotated, turns a bottom gear assembly (67). An inner screw (73) is connected to the bottom gear assembly (67) and thus turns therewith. Because of an interaction with an outer screw (77), rotation of the inner screw (73) initially causes a tube assembly (24) to move axially relative to a hexagonally shaped sleeve (23). A hex nut (81) is attached to the lower end of the tube assembly (24) to prevent rotation of the tube assembly (24). The nut (81) threadably engages the outer screw (77) and at one stage during the use of the jack (20), the nut (81) also engages a shoulder (82) of the sleeve (23) so that upon continued rotation of the screw (73), the tube assembly (24) and sleeve (23) move axially together. A load bearing assembly (25) is carried at the top of the tube assembly (24) and is adapted to be positioned under the frame or other component of a vehicle to be lifted. When the vehicle is being lifted, the jack (20) is allowed to tilt on selected of feet (48, 49, 50) positioned on the bottom of a base plate (22). The base plate (22) has a plurality of tabs (40) which are folded over edges (37) of a peripheral bottom plate (35) of the stand (21) to attach the base plate (22) to the stand (21). A bearing cup (71) positioned on the base plate (22) receives feet (72) of the bottom gear assembly (67) to floatingly position the bottom gear assembly (67) within the stand (21).

Vérin à vis (20) comportant un corps (21) logeant un pignon (58) dont la rotation met en oeuvre un engrenage (67). Une vis intérieure (73) tourne solidairement avec l'engrenage (67). La vis intérieure (73) étant en engrènement avec une vis extérieure (77), le mouvement de rotation de la vis intérieure (73) entraîne le déplacement axial d'un ensemble tubulaire (24) par rapport à un manchon de forme hexagonale (23). Un écrou hexagonal (81) est monté sur l'extrémité inférieure de l'ensemble tubulaire (24). L'écrou hexagonal (81) est vissé sur la vis extérieure (77) et, en appui sur l'épaulement (82) du manchon (23), entraîne, durant le mouvement de rotation de la vis (73), le mouvement axial de l'ensemble tubulaire (24) et du manchon (23). Une surface portante (25) à l'extrémité de l'ensemble tubulaire (24) peut être adaptée au dessous d'un châssis d'automobile ou à toute autre partie d'une automobile appelée à être soulevée. Lorsque le véhicule est soulevé, le vérin (20) transfère la charge sur les pieds de support (48,49 et 50) situés sous la base (22) du vérin. La base (22) comporte une pluralité de pattes (40) repliées par-dessus le rebord (37) de la plaque de fond (35) du corps (21) du vérin. Une coupelle de soutien (71) positionne sur la base (22) reçoit les pieds (72) de l'engrenage (67) pour assurer le positionnement approprié de l'engrenage (67) à l'intérieur du corps (21) du vérin.

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